Accelerate JEE 2020: Mole Concept and Stoichiometry-6 (31.07.2019)

A commercial sample of sodium oxalate (Na₂C₂O₄) weighing 0.20 g is dissolving in aqueous solution of H₂SO₄ and solution is titrated using 45 mL of 0.02 M KMnO₄ solution. The end point is overrun and back titration in carried out with 10 mL of 0.1 M oxalic acid solution. Find the percentage purity Na₂C₂O₄ in sample.

A solution containing  and  requires 300 ml of 0.1 N HCl using phenolphthalein as indicator. Methyl orange is then added to the above titrated solution when a further 25 ml of 0.2 N HCl is required. The amount of NaOH present in the solution is

A solution contains Cu⁺² and C₂O₄^-2 ions which on titration with 1 M KMnO₄ consumes 10 ml of the oxidizing agent for complete oxidation in acidic medium. The resulting solution is neutralized with Na₂CO₃, acidified with dil. CH₃COOH and is treated with excess of KI. The liberated iodine requires 25 ml of 1 M of hypo solution, then that will be the molar ratio of Cu⁺² to C₂O₄^-2 ions is solution?

A 100 ml solution of 0.1 N HCl was titrated with 0.2 N NaOH solution. The titration was discontinued after adding 30 ml of NaOH solution. The remaining titration was completed by adding 0.25 N KOH solution. The volume of KOH required for completing the titration is

An ion Mⁿ⁺ (molar mass = 30) discharged at cathode according to the following reaction Mⁿ⁺ + → CO₂ + M
10 ml of 0.1 M solution of M is converted into Mⁿ⁺ by 20 ml of 0.03 M solution of KMnO₄ in acidic Moderate. What weight of ‘M’ can be produced when 3 ampere current is passed through the solution for 9.65 hours.